Gold key is in a room that’s on 3rd from top level. Question is how do you open the door to get into this room? (answer: enter room from door on the ceiling, tx Rotfish.) Gold door is on the top level to the maze. Button on top level maze opens gate to get to the hole that drops you to the bottom level.
trick: bypass gold door by jumping on stair railing, then walk onto wall around the staircase, then jump onto the maze wall, and walla, don’t need the gold key. (and don’t need to explosive jump or noclip.) Also you can noclip above the map to see the entire maze if you want to quickly solve it.
rocket launcher: near gold gate is a step to walk on top of the wall without using the trick. Need to walk on the walls to get to the rocket launcher secret.
odd shortcut: can fall under the 1st staircase and exit the map on the bottom level. Can use TP in corner to get back up.
Maze is similar to the maze in Finder’s Keepers, with gates that need keys, and holes you fall through to get to different places. https://youtu.be/rDidRuEp8x4?si=bJKzOlGv_muMuMuc&t=169